Who is Kani from Peace Child and what is their importance?

Kani is a Sawi native that plots a legendary revenge against those who killed one of his own relatives. He persuades other men from his village to help, with the allure of becoming legendmakers in their own culture. His betrayal even involves the betrayal of a man by his own mother-in-law, usually a sacred relationship among the Sawi. Kani succeeds in his plot, and the resulting murders provide exciting stories around Sawi campfires in the region.